[Elecraft] Amplifier Hook Up

[Dave G4AON]

I use my K3/100 with an Acom 1000, I just connect the phono keying 
output to the amplifier keying input with a phono to phono screened 
lead. The Acom doesn't have ALC output, so it's not an issue. The 
K3/Acom combination works great on CW with no relay thumps or clicks 
from the almost silent vacuum relay in the Acom linear.

The ALC input to the K3 is positive going (0 to + 5 Volts on pin 15 of 
the Aux I/O socket) and has been discussed on the Reflector previously.

73 Dave, G4AON
K3/100 #80
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When examining the back panel of the K3 I see an output for PTT to control an
amplifier but I don't see any input for the amplifier AGC output to control
the transmitter power.  Surely this common feature was not overlooked on
such a feature rich transceiver.  Where is the connection for this control
and what control voltage is it looking for?  I don't see an amplifier hook
up diagram in the manual either.  Surely someone using this transceiver with
an amp!